Checking timing with HP Tuner?

[04lss]

Hi All, 

 

After some research i found out that you cannot time the vortec v8 with a timing light that you have to rely on the cam position data from a scanner. We tried our standard OBD scanner and had no luck. 

I Have HPtuners already for another one of my cars. can i configure the VCM scanner to pull the necessary data?  I have a 1999 tahoe vortec which i know is compatible. 

[Mikebtte]

That is correct as base timing is 0 and the ECM changes the timing as needed with data collected from the temp sensor and knock sensor.

Are you trying to advance the timing or what is it you are after?

[04lss]

4 hours ago, Mikebtte said:

That is correct as base timing is 0 and the ECM changes the timing as needed with data collected from the temp sensor and knock sensor.

Are you trying to advance the timing or what is it you are after?

The truck has some hesitation. I want to check the timing to make sure it isnt out of whack. I checked with HPT and was able to find cam offset. Is that the data point I want?  it was reading like -3.4, then -4.1

[bronyaur]

Yes, the cam retard offset is the data you want.  It should be no more than +/- 2.  Anything more will cause a hesitation, most often recognized when cruising on the freeway, but occasionally on acceleration from a stop as well.  Make sure you read the data while the engine is a little over 1500rpm.

[Mikebtte]

I have seen hesitation from week fuel pumps and 305 injectors in a 350 and the other way around. Make sure you have fuel pressure in spec.